Question

which pair of elements has the same valence electronic configuration of $ns^{2}$?

Explanation:

• For elements in the same group of the periodic table, they have the same valence - shell electron configuration.
• The general valence - shell electron configuration for group 14 (carbon group) is \(ns^{2}np^{2}\).
• Germanium (\(Ge\)) has an atomic number of 32. Its electron configuration is \([Ar]3d^{10}4s^{2}4p^{2}\), and its valence - shell electron configuration is \(4s^{2}4p^{2}\).
• Lead (\(Pb\)) has an atomic number of 82. Its electron configuration is \([Xe]4f^{14}5d^{10}6s^{2}6p^{2}\), and its valence - shell electron configuration is \(6s^{2}6p^{2}\).

Answer:

B. Ge and Pb